Dual pack-off socket



y 10, 1951 D. D. PILGRIM EI'AL 2,559,997

. DUAL PACK-OFF SOCKET Filed June 20, 1947 Daniel .D. Pilgrim. Jo/m J. Necgher.

Patented July 10, 1951 p U I ATT OFFICE Daniel D. Pilgrim and John J. Meagher, Bakersfield, Calif.

Application June 20, 1947, Serial No. 756,066

2 Claims.

This invention relates to adual pack-off socket for use in recovering broken sections of pipe in an oil well, or the like.

An object of our invention is to provide a novel fishing tool of the pack-01f socket type in which both the inside and the outside of the lost or broken pipe is packed-off when engaged by the tool.

A feature of our invention is to thus provide a means whereby fluid circulation can be forced into the lost or broken section of the pipe, which is important in loosening the pipe so that it may be removed to the surface.

Another object of our invention is to provide a novel dual pack-off socket in which the slip hanger is so constructed that it will engage the top of the lost section of pipe, and thereby permit control of theslip hanger so that it may be released to permit the slips to drop downwardly, and press inwardly against the lost pipe.

Another feature of our invention is to provide a dual pack-oi? socket in which the internal and external members are run simultaneously with the gripping or fishing portion of the tool, thus permitting a circulation of fluid into the lost section of the pipe at the same time that pipe is gripped, and a strain is placed upon the pipe prior to its removal from the well.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing:

Figure 1 is a longitudinal sectional View of our dual pack-off socket.

Figure 2 is a fragmentary side elevation of the head or coupling.

Figure 3 is an enlarged bottom plan view of the slip hanger.

Referring more particularly to the drawing, the numeral l indicates a head or coupling member, into which or on to which the drill pipe is threaded, and the threads for the drill pipe are shown at 2. A sleeve 3 screws on to the head I and this sleeve is provided with a tapered seat t, at its lower end, and the purpose of this seat will be further described. The head i is provided with one or more bayonet slots 5, and these bayonet slots are used to control the slip hanger 6. The slip hanger is provided with pins 1 which project outwardly into the bayonet slots 5. A plurality of slips 3 depend from the slip hanger 6 and are supported on this slip hanger. The slips are tapered on their lower ends as shown at 9, and when this tapered portion or" the slip engages the seat 41, the slips will be forced inwardly, to grip the lost section of pipe it.

In the drawing, the upper part of the pipe I0 is shown in dotted lines, the purpose of this being to clarify the drawing, in that if the pipe Ill were shown solid, it would hide a portion of the slips 8. When the tool is lowered into the well, the pipe is will slide into the tool until it strikes the bottom of the slip hanger 6. I

A plurality of radial teeth I! are formed on the bottom of the slip hanger and these teeth will engage the top of the pipe Ill, thus holding the slip hanger 6 against rotation and enabling the head I to be rotated relative to the slip hanger, thereby moving the pin 1 into the vertical portion of the bayonet slots 5. When the pins are in this vertical portion of the bayonet slot, the entire assembly of slip hanger and slips can drop downwardly so that the lower portion of the slips will engage the seat 4, thus pressing these slips inwardly against the lost pipe or fish iii.

A spring [2 engages the slip hanger 6 to urge this slip hanger downwardly. A tube l3 screws in to the head I, that is, into the bore M of the head and a packing or cup rubber I5 is mounted on the lower end of the tube. This packing or cup engages the inner wall of the pipe l0, and the cup is expanded by fluid pressure, thus sealing the inside of the pipe I53, i. e., providing an inside pack-off. Fluid, when forced through the drill pipe, and into our tool, flows through the tube [3 and thence downwardly into the fish ID. The outside of the fish E8 is also packed-01f by the external packing ring 16, which is mounted in the sub ll, which screws on to the bottom of the sleeve 3. It will thus be evident that we packofi the fish on both the inside and the outside and fluid under pressure can thus be compelled to fio'w around the bottom of the fish It], thus loosening the formation around the fish, and enabling the same to be removed to the surface by the slip 8.

Having described our invention, we claim:

1. A dual pack-oh" socket, comprising a head, a slip hanger mounted in the head, a sleeve depending from the head, a slip socket mounted in the head, latch means in the head engaged by the slip hanger, slips depending from the slip hanger, and teeth on the bottom surface of the slip hanger adapted to engage the lost section of the pipe, whereby said slip hanger is held against rotation when said teeth engage the lost section of pipe, a pipe depending from said head, a packing mounted on the lower end of the pipe and engaging the inside of the lost pipe, and an outside packing engaging the outside of the lost pipe, and means mounting said last named packing, said first and last named packings being in substantially the same horizontal plane.

2. A dual pack-off socket, comprising a head, said head having a bayonet slot therein, a slip hanger, a pin projecting from the slip hanger into the bayonet slot, a sleeve depending from the head, slips depending from the slip hanger and arranged within the sleeve, teeth on the bottom 10 of the slip hanger, engageable with the top of a 10st pipe section, thereby holding the slip hanger stationary relative to said head, a tube depending from the head and extending through the slip hanger, packing mounted on the lower end of the tube and engaging the inside of the lost pipe, and

4 packing on said sleeve, said first and last named packings being in substantially the same horizontal plane.

DANIEL D. PILGRIM.

JOHN J. MEAGHER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,153,818 Osborne Sept. 14, 1915 1,569,318 Ligon Jan. 12, 1926 2,070,869 Sorensen Feb. 16, 1937 2,213,987 Layne Sept. 10, 1940 2,242,279 Young May 20, 1941 

